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Revenue from contracts with customers (Tables) | 3 Months Ended
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Mar. 31, 2023
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | The following table depicts the disaggregation of revenue by type of products or services and timing of transfer of products or services (in thousands):
| Three months ended March 31,
| 2023 |  | 2022
Type of products or services |  |  |
QCaaS | $ | 1,168 |  |  | $ | 1,384 |
Professional services | 406 |  |  | 309 |
Other revenue | 9 |  |  | 20 |
Total revenue, net | $ | 1,583 |  |  | $ | 1,713 |
Timing of revenue recognition |  |  |
Revenue recognized over the time | $ | 1,542 |  |  | $ | 1,662 |
Revenue recognized at a point in time | 41 |  |  | 51 |
Total revenue, net | $ | 1,583 |  |  | $ | 1,713 |
The following table presents a summary of revenue by geography for the three months ended March 31, 2023 and 2022 (in thousands):
| Three months ended March 31,
| 2023 |  | 2022
United States | $ | 247 |  |  | $ | 777 |
Japan | 308 |  |  | 434 |
Germany | 288 |  |  | 263 |
United Kingdom | 231 |  |  | — |
Other | 509 |  |  | 239 |
Total revenue | $ | 1,583 |  |  | $ | 1,713 |
Significant customers | The tables below present the significant customers on a percentage of total revenue basis for the three months ended March 31, 2023 and 2022.
| Three months ended March 31,
| 2023 |  | 2022
Customer A | 15 | % |  | 14 | %
Customer B | 13 | % |  | 13 | %
Accounts receivable, contract assets and liabilities, and changes in deferred revenue | The following table provides information about account receivable, contract assets and liabilities as of March 31, 2023 and December 31, 2022 (in thousands):
| March 31, |  | December 31,
| 2023 |  | 2022
Contract assets: |  |  |
Trade account receivable | $ | 542 |  |  | $ | 757 |
Unbilled receivables, included in 'Prepaid expenses and other current assets' | 59 |  |  | 58 |
Total contract assets | 601 |  |  | 815 |
Contract liabilities: |  |  |
Deferred revenue, current | 1,827 |  |  | 1,781 |
Deferred revenue, noncurrent | 9 |  |  | 9 |
Customer deposit, included in 'Accrued expenses and other current liabilities' | 45 |  |  | 45 |
Total contract liabilities | $ | 1,881 |  |  | $ | 1,835 |
Changes in deferred revenue from contracts with customers were as follows (in thousands):
| March 31, |  | December 31,
| 2023 |  | 2022
Balance at beginning of period | $ | 1,790 |  |  | $ | 2,719 |
Deferral of revenue | 1,166 |  |  | 5,325 |
Recognition of deferred revenue | (1,120) |  |  | (6,254) |
Balance at end of period | $ | 1,836 |  |  | $ | 1,790 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-10 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 + Details
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